My quickis

On all exacto handles wrap  a piece of tape leaving it stick out about .5inch this will prevent you new #11 blade from roling off you desk and into your leg/foot or hard wood floor

When dealing with seams apply tape to  both side , apply putty, remove tape, then taque Q-Tips(real one its woth it) and nail polish remover(with acetone)and rubaway the excess putty. it will save you tons of sanding/rescriping and you dont have to clean the mess!! 

BTW for that  91% ISO cleaning trick ive always done this with 50% or 70% rubbing alchool to get the finger grease off my model and never had an issue over Humbrol enamels (i apply it between EVERY coat of paint)